纤毛虫是单细胞的原生动物，在进化上属于低等的真核生物，但其各细胞器之间囊泡运输系统极为完善。
Ciliate, a unicellular protozoa and low eukaryotes in evolution, has perfect vesicular trafficking system among organelles.
它是单细胞水生真核生物，并应该具备上述动物和植物细胞的共同特点。
This ancestor was a single-celled aquatic eukaryote, and would have had the common features of animal and plant cells described above.
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